@dansup sorry for bothering again - while pixelfed.de does use Hetzner as provider I checked access via the web/browser interface from the iPhone (Firefox) - here it works fine with all firewall rules enabled. Trying then the IOS-App I again can‘t access posts (just my profile, but it won‘t show pics from posts („no posts yet“)) - (same with pixelfed.social).So it still seems it’s within the app?